串并联架构区域电能路由器柔性运行与功率流控制策略

doi:10.19595/j.cnki.1000-6753.tces.L90442

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摘要电能路由器是能源互联网的核心设备,是下一代智能电网的重要标志。受拓扑架构限制,传统区域电能路由器存在带载能力有限和无功功率无法柔性运行的缺点。为此,该文拟构建一种串并联架构新型区域电能路由器,通过增加一条并联能量流动通道,突破传统路由器 100%能量传输和无功功率刚性运行的双重界限。对串并联架构路由器的功率流柔性运行机理进行分析,给出其在不同运行模式下功率流的计算方法,以揭示路由器系统的运行规律。为实现对能量的主动控制,提出一种双自由度功率流柔性控制策略,分别控制交流电网输入电流幅值和输出交流母线电压相位角的自由度,从而灵活配比交流电网与直流母线之间的有功功率以及串、并联变换器之间的无功功率。在不增加系统容量和交流输入配电网的情况下,可实现有功功率最大允许量为200% 及无功功率最大允许量为 120% 的传输目标,为路由器实现大功率能量柔性传输提供了设计思路和解决方案。

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关键词 ：能源互联网, 电能路由器, 功率流, 柔性运行, 双自由度

Abstract：Electric power router (EPR) is a core equipment in the energy internet and an important symbol of the next generation smart grid. Due to the limitation of topology architecture, the traditional region EPR (REPR) has the disadvantages of limited loading capacity and inability of flexible operation for the reactive power. To this end, this paper intends to build a new type of REPR with a series and parallel architecture (SPA-REPR). By adding a parallel energy flow path, it will break the double limits of the traditional EPR's 100% energy transmission and the reactive power rigid operation. The power flow flexible operation mechanism of SPA-REPR is analyzed, the calculation method of power flow in different operation modes is given, so that its operation law is clarified. To realize the active control for system's energy, a two-degree-of-freedom power flow flexible control strategy (TDF-PFFCS) is proposed to control the TDFs of the AC grid input current amplitude and output AC bus voltage phase angle, so as to flexibly match the active power between the AC grid and the DC bus and the reactive power between the series and parallel converters. As a result, without increasing the system capacity and AC input power distribution, the transmission targets of 200% active power and 120% reactive power can be achieved, which provides novel design ideas and solutions for EPRs to achieve high-power energy flexible transmission.

Key words： Energy internet electric power router power flow flexible operation two-degree-of-freedom

收稿日期: 2020-07-11

PACS:

TM721

基金资助:国家自然科学基金（62003297）、河北省自然科学基金（E2020203192）、河北省博士后择优项目（B2019003024）和秦皇岛市科技支撑计划项目（201902A225）资助项目

通讯作者: 张纯江男,1961年生,教授,博士生导师,研究方向为新能源分布式并网发电及控制、电力电子高频功率变换等。E-mail：zhangcj@ysu.edu.cn

作者简介: 赵晓君男,1985年生,博士,讲师,研究方向为电能路由器系统运行及其控制、新能源发电变流器及其控制等。E-mail：zhaoxiaojun@ysu.edu.cn

引用本文:

赵晓君, 张纯江, 柴秀慧, 郭小强, 汪龙. 串并联架构区域电能路由器柔性运行与功率流控制策略[J]. 电工技术学报, 2021, 36(7): 1480-1491. Zhao Xiaojun, Zhang Chunjiang, Chai Xiuhui, Guo Xiaoqiang, Wang Long. Flexible Operation and Power Flow Control Strategies for Series-Parallel Architecture Region Electric Power Router. Transactions of China Electrotechnical Society, 2021, 36(7): 1480-1491.

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